A mainframe db can get messed up when switching from daylight savings time. On the 
morning of Oct 26 an hour will be ran twice. A transaction could run at 1:15 AM, the 
hour be changed from 2 to 1 AM, and then another transaction ran after the first but 
be logged as 1:10 AM. That can mess up redo logs etc.

How does Exchange's db keep it straight?

Regards, 
Orin




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